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+.TH FALLOCATE 1 ubase-VERSION
+.SH NAME
+\fBfallocate\fR - preallocate blocks to a file
+.SH SYNOPSIS
+\fBfallocate\fR [\fB-o\fI offset\fR] \fB-l\fR \fIlength file\fR
+.SH DESCRIPTION
+\fBfallocate\fR preallocates blocks to a file.  Only certain filesystems
+support the fallocate system call.  This is a very fast operation to allocate
+uninitialized blocks in a file without doing any IO.
+As  of the Linux Kernel v2.6.31, the fallocate system call is supported
+by the btrfs, ext4, ocfs2, and xfs filesystems.
+.SH OPTIONS
+.TP
+\fB-o\fR Specifies the beginning offset of the allocation, in bytes.
+.TP
+\fB-l\fR Specifies the length of the allocation, in bytes.
+.SH SEE ALSO
+fallocate(2)